Worth 5 stars for the discussion of double activity alone. If you want to understand Plotinus' views on emanation, this is far and away the best place to go. I'd almost go so far as to say this book is the key to it all! Almost. In particular, the sheer clarity of the writing is a huge boon to Plotinus scholarship, which is too often just a tad less rigorous than one would like. While Plotinus' thought is by no means intuitive or commonsensical, this work shows that it does not suffer from a lack of coherence or profound metaphysical insight.